33SL - Ultra low-kickback chisel chain for both professional and consumer users. Provides high cutting speed from 2.5 to 3.5 inches. Chain has .325" pitch. Efficient, smooth cutting. Excellent, stay-sharp. 72SG - Semi-chisel cutter provides cutting efficiency and performance in dirty or rocky conditions. No interference with chip clearance or flow. Standard 72 series chain chassis. Reduces kickback and allows 3.0 to 6.0 cubic inches cutting speed. 3/8" pitch.